A nurse is reinforcing teaching with a parent of an infant who has gastroesophageal reflux. Which of the following statements by the parent indicates an understanding of the teaching?

"I will keep my baby in an upright position after feeding."

"I will have to feed my baby formula, rather than breast milk."

"My baby's formula can be thickened with oatmeal."

"I should move my baby into a side-lying position during sleep."